Throttle and (simulated) brake trace

My car generates a throttle position data channel via OBD2, but I don't get brake position data, only a 0/1 off/on signal. From sim racing, I know how useful it is to be able to see your brake trace, and see if you're releasing the brakes smoothly or not. I tried to use the longitudinal G force plot as a proxy for the brake trace. I think it turned out pretty good! It shows some wiggles when I'm off the throttle to shift, obviously I'm not braking there. But overall, it does a decent job I think.